aboutsummaryrefslogtreecommitdiff
path: root/drivers/usb/serial/kl5kusb105.c
blob: 10f05407e535da02e606865b9b7386c73dd4174b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
/*
 * KLSI KL5KUSB105 chip RS232 converter driver
 *
 *   Copyright (C) 2010 Johan Hovold <jhovold@gmail.com>
 *   Copyright (C) 2001 Utz-Uwe Haus <haus@uuhaus.de>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 * All information about the device was acquired using SniffUSB ans snoopUSB
 * on Windows98.
 * It was written out of frustration with the PalmConnect USB Serial adapter
 * sold by Palm Inc.
 * Neither Palm, nor their contractor (MCCI) or their supplier (KLSI) provided
 * information that was not already available.
 *
 * It seems that KLSI bought some silicon-design information from ScanLogic,
 * whose SL11R processor is at the core of the KL5KUSB chipset from KLSI.
 * KLSI has firmware available for their devices; it is probable that the
 * firmware differs from that used by KLSI in their products. If you have an
 * original KLSI device and can provide some information on it, I would be
 * most interested in adding support for it here. If you have any information
 * on the protocol used (or find errors in my reverse-engineered stuff), please
 * let me know.
 *
 * The code was only tested with a PalmConnect USB adapter; if you
 * are adventurous, try it with any KLSI-based device and let me know how it
 * breaks so that I can fix it!
 */

/* TODO:
 *	check modem line signals
 *	implement handshaking or decide that we do not support it
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/uaccess.h>
#include <asm/unaligned.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include "kl5kusb105.h"

static bool debug;

/*
 * Version Information
 */
#define DRIVER_VERSION "v0.4"
#define DRIVER_AUTHOR "Utz-Uwe Haus <haus@uuhaus.de>, Johan Hovold <jhovold@gmail.com>"
#define DRIVER_DESC "KLSI KL5KUSB105 chipset USB->Serial Converter driver"


/*
 * Function prototypes
 */
static int  klsi_105_startup(struct usb_serial *serial);
static void klsi_105_release(struct usb_serial *serial);
static int  klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port);
static void klsi_105_close(struct usb_serial_port *port);
static void klsi_105_set_termios(struct tty_struct *tty,
			struct usb_serial_port *port, struct ktermios *old);
static int  klsi_105_tiocmget(struct tty_struct *tty);
static int  klsi_105_tiocmset(struct tty_struct *tty,
			unsigned int set, unsigned int clear);
static void klsi_105_process_read_urb(struct urb *urb);
static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
						void *dest, size_t size);

/*
 * All of the device info needed for the KLSI converters.
 */
static const struct usb_device_id id_table[] = {
	{ USB_DEVICE(PALMCONNECT_VID, PALMCONNECT_PID) },
	{ USB_DEVICE(KLSI_VID, KLSI_KL5KUSB105D_PID) },
	{ }		/* Terminating entry */
};

MODULE_DEVICE_TABLE(usb, id_table);

static struct usb_driver kl5kusb105d_driver = {
	.name =		"kl5kusb105d",
	.probe =	usb_serial_probe,
	.disconnect =	usb_serial_disconnect,
	.id_table =	id_table,
};

static struct usb_serial_driver kl5kusb105d_device = {
	.driver = {
		.owner =	THIS_MODULE,
		.name =		"kl5kusb105d",
	},
	.description =		"KL5KUSB105D / PalmConnect",
	.id_table =		id_table,
	.num_ports =		1,
	.bulk_out_size =	64,
	.open =			klsi_105_open,
	.close =		klsi_105_close,
	.set_termios =		klsi_105_set_termios,
	/*.break_ctl =		klsi_105_break_ctl,*/
	.tiocmget =		klsi_105_tiocmget,
	.tiocmset =		klsi_105_tiocmset,
	.attach =		klsi_105_startup,
	.release =		klsi_105_release,
	.throttle =		usb_serial_generic_throttle,
	.unthrottle =		usb_serial_generic_unthrottle,
	.process_read_urb =	klsi_105_process_read_urb,
	.prepare_write_buffer =	klsi_105_prepare_write_buffer,
};

static struct usb_serial_driver * const serial_drivers[] = {
	&kl5kusb105d_device, NULL
};

struct klsi_105_port_settings {
	__u8	pktlen;		/* always 5, it seems */
	__u8	baudrate;
	__u8	databits;
	__u8	unknown1;
	__u8	unknown2;
} __attribute__ ((packed));

struct klsi_105_private {
	struct klsi_105_port_settings	cfg;
	struct ktermios			termios;
	unsigned long			line_state; /* modem line settings */
	spinlock_t			lock;
};


/*
 * Handle vendor specific USB requests
 */


#define KLSI_TIMEOUT	 5000 /* default urb timeout */

static int klsi_105_chg_port_settings(struct usb_serial_port *port,
				      struct klsi_105_port_settings *settings)
{
	int rc;

	rc = usb_control_msg(port->serial->dev,
			usb_sndctrlpipe(port->serial->dev, 0),
			KL5KUSB105A_SIO_SET_DATA,
			USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_INTERFACE,
			0, /* value */
			0, /* index */
			settings,
			sizeof(struct klsi_105_port_settings),
			KLSI_TIMEOUT);
	if (rc < 0)
		dev_err(&port->dev,
			"Change port settings failed (error = %d)\n", rc);
	dev_info(&port->serial->dev->dev,
		 "%d byte block, baudrate %x, databits %d, u1 %d, u2 %d\n",
		 settings->pktlen, settings->baudrate, settings->databits,
		 settings->unknown1, settings->unknown2);
	return rc;
}

/* translate a 16-bit status value from the device to linux's TIO bits */
static unsigned long klsi_105_status2linestate(const __u16 status)
{
	unsigned long res = 0;

	res =   ((status & KL5KUSB105A_DSR) ? TIOCM_DSR : 0)
	      | ((status & KL5KUSB105A_CTS) ? TIOCM_CTS : 0)
	      ;

	return res;
}

/*
 * Read line control via vendor command and return result through
 * *line_state_p
 */
/* It seems that the status buffer has always only 2 bytes length */
#define KLSI_STATUSBUF_LEN	2
static int klsi_105_get_line_state(struct usb_serial_port *port,
				   unsigned long *line_state_p)
{
	int rc;
	u8 *status_buf;
	__u16 status;

	dev_info(&port->serial->dev->dev, "sending SIO Poll request\n");

	status_buf = kmalloc(KLSI_STATUSBUF_LEN, GFP_KERNEL);
	if (!status_buf) {
		dev_err(&port->dev, "%s - out of memory for status buffer.\n",
				__func__);
		return -ENOMEM;
	}
	status_buf[0] = 0xff;
	status_buf[1] = 0xff;
	rc = usb_control_msg(port->serial->dev,
			     usb_rcvctrlpipe(port->serial->dev, 0),
			     KL5KUSB105A_SIO_POLL,
			     USB_TYPE_VENDOR | USB_DIR_IN,
			     0, /* value */
			     0, /* index */
			     status_buf, KLSI_STATUSBUF_LEN,
			     10000
			     );
	if (rc < 0)
		dev_err(&port->dev, "Reading line status failed (error = %d)\n",
			rc);
	else {
		status = get_unaligned_le16(status_buf);

		dev_info(&port->serial->dev->dev, "read status %x %x",
			 status_buf[0], status_buf[1]);

		*line_state_p = klsi_105_status2linestate(status);
	}

	kfree(status_buf);
	return rc;
}


/*
 * Driver's tty interface functions
 */

static int klsi_105_startup(struct usb_serial *serial)
{
	struct klsi_105_private *priv;
	int i;

	/* check if we support the product id (see keyspan.c)
	 * FIXME
	 */

	/* allocate the private data structure */
	for (i = 0; i < serial->num_ports; i++) {
		priv = kmalloc(sizeof(struct klsi_105_private),
						   GFP_KERNEL);
		if (!priv) {
			dbg("%skmalloc for klsi_105_private failed.", __func__);
			i--;
			goto err_cleanup;
		}
		/* set initial values for control structures */
		priv->cfg.pktlen    = 5;
		priv->cfg.baudrate  = kl5kusb105a_sio_b9600;
		priv->cfg.databits  = kl5kusb105a_dtb_8;
		priv->cfg.unknown1  = 0;
		priv->cfg.unknown2  = 1;

		priv->line_state    = 0;

		usb_set_serial_port_data(serial->port[i], priv);

		spin_lock_init(&priv->lock);

		/* priv->termios is left uninitialized until port opening */
		init_waitqueue_head(&serial->port[i]->write_wait);
	}

	return 0;

err_cleanup:
	for (; i >= 0; i--) {
		priv = usb_get_serial_port_data(serial->port[i]);
		kfree(priv);
		usb_set_serial_port_data(serial->port[i], NULL);
	}
	return -ENOMEM;
}

static void klsi_105_release(struct usb_serial *serial)
{
	int i;

	dbg("%s", __func__);

	for (i = 0; i < serial->num_ports; ++i)
		kfree(usb_get_serial_port_data(serial->port[i]));
}

static int  klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port)
{
	struct klsi_105_private *priv = usb_get_serial_port_data(port);
	int retval = 0;
	int rc;
	int i;
	unsigned long line_state;
	struct klsi_105_port_settings *cfg;
	unsigned long flags;

	dbg("%s port %d", __func__, port->number);

	/* Do a defined restart:
	 * Set up sane default baud rate and send the 'READ_ON'
	 * vendor command.
	 * FIXME: set modem line control (how?)
	 * Then read the modem line control and store values in
	 * priv->line_state.
	 */
	cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
	if (!cfg) {
		dev_err(&port->dev, "%s - out of memory for config buffer.\n",
				__func__);
		return -ENOMEM;
	}
	cfg->pktlen   = 5;
	cfg->baudrate = kl5kusb105a_sio_b9600;
	cfg->databits = kl5kusb105a_dtb_8;
	cfg->unknown1 = 0;
	cfg->unknown2 = 1;
	klsi_105_chg_port_settings(port, cfg);

	/* set up termios structure */
	spin_lock_irqsave(&priv->lock, flags);
	priv->termios.c_iflag = tty->termios->c_iflag;
	priv->termios.c_oflag = tty->termios->c_oflag;
	priv->termios.c_cflag = tty->termios->c_cflag;
	priv->termios.c_lflag = tty->termios->c_lflag;
	for (i = 0; i < NCCS; i++)
		priv->termios.c_cc[i] = tty->termios->c_cc[i];
	priv->cfg.pktlen   = cfg->pktlen;
	priv->cfg.baudrate = cfg->baudrate;
	priv->cfg.databits = cfg->databits;
	priv->cfg.unknown1 = cfg->unknown1;
	priv->cfg.unknown2 = cfg->unknown2;
	spin_unlock_irqrestore(&priv->lock, flags);

	/* READ_ON and urb submission */
	rc = usb_serial_generic_open(tty, port);
	if (rc) {
		retval = rc;
		goto exit;
	}

	rc = usb_control_msg(port->serial->dev,
			     usb_sndctrlpipe(port->serial->dev, 0),
			     KL5KUSB105A_SIO_CONFIGURE,
			     USB_TYPE_VENDOR|USB_DIR_OUT|USB_RECIP_INTERFACE,
			     KL5KUSB105A_SIO_CONFIGURE_READ_ON,
			     0, /* index */
			     NULL,
			     0,
			     KLSI_TIMEOUT);
	if (rc < 0) {
		dev_err(&port->dev, "Enabling read failed (error = %d)\n", rc);
		retval = rc;
	} else
		dbg("%s - enabled reading", __func__);

	rc = klsi_105_get_line_state(port, &line_state);
	if (rc >= 0) {
		spin_lock_irqsave(&priv->lock, flags);
		priv->line_state = line_state;
		spin_unlock_irqrestore(&priv->lock, flags);
		dbg("%s - read line state 0x%lx", __func__, line_state);
		retval = 0;
	} else
		retval = rc;

exit:
	kfree(cfg);
	return retval;
}

static void klsi_105_close(struct usb_serial_port *port)
{
	int rc;

	dbg("%s port %d", __func__, port->number);

	mutex_lock(&port->serial->disc_mutex);
	if (!port->serial->disconnected) {
		/* send READ_OFF */
		rc = usb_control_msg(port->serial->dev,
				     usb_sndctrlpipe(port->serial->dev, 0),
				     KL5KUSB105A_SIO_CONFIGURE,
				     USB_TYPE_VENDOR | USB_DIR_OUT,
				     KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
				     0, /* index */
				     NULL, 0,
				     KLSI_TIMEOUT);
		if (rc < 0)
			dev_err(&port->dev,
				"Disabling read failed (error = %d)\n", rc);
	}
	mutex_unlock(&port->serial->disc_mutex);

	/* shutdown our bulk reads and writes */
	usb_serial_generic_close(port);

	/* wgg - do I need this? I think so. */
	usb_kill_urb(port->interrupt_in_urb);
}

/* We need to write a complete 64-byte data block and encode the
 * number actually sent in the first double-byte, LSB-order. That
 * leaves at most 62 bytes of payload.
 */
#define KLSI_HDR_LEN		2
static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
						void *dest, size_t size)
{
	unsigned char *buf = dest;
	int count;

	count = kfifo_out_locked(&port->write_fifo, buf + KLSI_HDR_LEN, size,
								&port->lock);
	put_unaligned_le16(count, buf);

	return count + KLSI_HDR_LEN;
}

/* The data received is preceded by a length double-byte in LSB-first order.
 */
static void klsi_105_process_read_urb(struct urb *urb)
{
	struct usb_serial_port *port = urb->context;
	unsigned char *data = urb->transfer_buffer;
	struct tty_struct *tty;
	unsigned len;

	/* empty urbs seem to happen, we ignore them */
	if (!urb->actual_length)
		return;

	if (urb->actual_length <= KLSI_HDR_LEN) {
		dbg("%s - malformed packet", __func__);
		return;
	}

	tty = tty_port_tty_get(&port->port);
	if (!tty)
		return;

	len = get_unaligned_le16(data);
	if (len > urb->actual_length - KLSI_HDR_LEN) {
		dbg("%s - packet length mismatch", __func__);
		len = urb->actual_length - KLSI_HDR_LEN;
	}

	tty_insert_flip_string(tty, data + KLSI_HDR_LEN, len);
	tty_flip_buffer_push(tty);
	tty_kref_put(tty);
}

static void klsi_105_set_termios(struct tty_struct *tty,
				 struct usb_serial_port *port,
				 struct ktermios *old_termios)
{
	struct klsi_105_private *priv = usb_get_serial_port_data(port);
	unsigned int iflag = tty->termios->c_iflag;
	unsigned int old_iflag = old_termios->c_iflag;
	unsigned int cflag = tty->termios->c_cflag;
	unsigned int old_cflag = old_termios->c_cflag;
	struct klsi_105_port_settings *cfg;
	unsigned long flags;
	speed_t baud;

	cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
	if (!cfg) {
		dev_err(&port->dev, "%s - out of memory for config buffer.\n",
				__func__);
		return;
	}

	/* lock while we are modifying the settings */
	spin_lock_irqsave(&priv->lock, flags);

	/*
	 * Update baud rate
	 */
	baud = tty_get_baud_rate(tty);

	if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
		/* reassert DTR and (maybe) RTS on transition from B0 */
		if ((old_cflag & CBAUD) == B0) {
			dbg("%s: baud was B0", __func__);
#if 0
			priv->control_state |= TIOCM_DTR;
			/* don't set RTS if using hardware flow control */
			if (!(old_cflag & CRTSCTS))
				priv->control_state |= TIOCM_RTS;
			mct_u232_set_modem_ctrl(serial, priv->control_state);
#endif
		}
	}
	switch (baud) {
	case 0: /* handled below */
		break;
	case 1200:
		priv->cfg.baudrate = kl5kusb105a_sio_b1200;
		break;
	case 2400:
		priv->cfg.baudrate = kl5kusb105a_sio_b2400;
		break;
	case 4800:
		priv->cfg.baudrate = kl5kusb105a_sio_b4800;
		break;
	case 9600:
		priv->cfg.baudrate = kl5kusb105a_sio_b9600;
		break;
	case 19200:
		priv->cfg.baudrate = kl5kusb105a_sio_b19200;
		break;
	case 38400:
		priv->cfg.baudrate = kl5kusb105a_sio_b38400;
		break;
	case 57600:
		priv->cfg.baudrate = kl5kusb105a_sio_b57600;
		break;
	case 115200:
		priv->cfg.baudrate = kl5kusb105a_sio_b115200;
		break;
	default:
		dbg("KLSI USB->Serial converter:"
		    " unsupported baudrate request, using default of 9600");
			priv->cfg.baudrate = kl5kusb105a_sio_b9600;
		baud = 9600;
		break;
	}
	if ((cflag & CBAUD) == B0) {
		dbg("%s: baud is B0", __func__);
		/* Drop RTS and DTR */
		/* maybe this should be simulated by sending read
		 * disable and read enable messages?
		 */
		;
#if 0
		priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
		mct_u232_set_modem_ctrl(serial, priv->control_state);
#endif
	}
	tty_encode_baud_rate(tty, baud, baud);

	if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
		/* set the number of data bits */
		switch (cflag & CSIZE) {
		case CS5:
			dbg("%s - 5 bits/byte not supported", __func__);
			spin_unlock_irqrestore(&priv->lock, flags);
			goto err;
		case CS6:
			dbg("%s - 6 bits/byte not supported", __func__);
			spin_unlock_irqrestore(&priv->lock, flags);
			goto err;
		case CS7:
			priv->cfg.databits = kl5kusb105a_dtb_7;
			break;
		case CS8:
			priv->cfg.databits = kl5kusb105a_dtb_8;
			break;
		default:
			dev_err(&port->dev,
				"CSIZE was not CS5-CS8, using default of 8\n");
			priv->cfg.databits = kl5kusb105a_dtb_8;
			break;
		}
	}

	/*
	 * Update line control register (LCR)
	 */
	if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))
	    || (cflag & CSTOPB) != (old_cflag & CSTOPB)) {
		/* Not currently supported */
		tty->termios->c_cflag &= ~(PARENB|PARODD|CSTOPB);
#if 0
		priv->last_lcr = 0;

		/* set the parity */
		if (cflag & PARENB)
			priv->last_lcr |= (cflag & PARODD) ?
				MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN;
		else
			priv->last_lcr |= MCT_U232_PARITY_NONE;

		/* set the number of stop bits */
		priv->last_lcr |= (cflag & CSTOPB) ?
			MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1;

		mct_u232_set_line_ctrl(serial, priv->last_lcr);
#endif
		;
	}
	/*
	 * Set flow control: well, I do not really now how to handle DTR/RTS.
	 * Just do what we have seen with SniffUSB on Win98.
	 */
	if ((iflag & IXOFF) != (old_iflag & IXOFF)
	    || (iflag & IXON) != (old_iflag & IXON)
	    ||  (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
		/* Not currently supported */
		tty->termios->c_cflag &= ~CRTSCTS;
		/* Drop DTR/RTS if no flow control otherwise assert */
#if 0
		if ((iflag & IXOFF) || (iflag & IXON) || (cflag & CRTSCTS))
			priv->control_state |= TIOCM_DTR | TIOCM_RTS;
		else
			priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
		mct_u232_set_modem_ctrl(serial, priv->control_state);
#endif
		;
	}
	memcpy(cfg, &priv->cfg, sizeof(*cfg));
	spin_unlock_irqrestore(&priv->lock, flags);

	/* now commit changes to device */
	klsi_105_chg_port_settings(port, cfg);
err:
	kfree(cfg);
}

#if 0
static void mct_u232_break_ctl(struct tty_struct *tty, int break_state)
{
	struct usb_serial_port *port = tty->driver_data;
	struct usb_serial *serial = port->serial;
	struct mct_u232_private *priv =
				(struct mct_u232_private *)port->private;
	unsigned char lcr = priv->last_lcr;

	dbg("%sstate=%d", __func__, break_state);

	/* LOCKING */
	if (break_state)
		lcr |= MCT_U232_SET_BREAK;

	mct_u232_set_line_ctrl(serial, lcr);
}
#endif

static int klsi_105_tiocmget(struct tty_struct *tty)
{
	struct usb_serial_port *port = tty->driver_data;
	struct klsi_105_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;
	int rc;
	unsigned long line_state;
	dbg("%s - request, just guessing", __func__);

	rc = klsi_105_get_line_state(port, &line_state);
	if (rc < 0) {
		dev_err(&port->dev,
			"Reading line control failed (error = %d)\n", rc);
		/* better return value? EAGAIN? */
		return rc;
	}

	spin_lock_irqsave(&priv->lock, flags);
	priv->line_state = line_state;
	spin_unlock_irqrestore(&priv->lock, flags);
	dbg("%s - read line state 0x%lx", __func__, line_state);
	return (int)line_state;
}

static int klsi_105_tiocmset(struct tty_struct *tty,
			     unsigned int set, unsigned int clear)
{
	int retval = -EINVAL;

	dbg("%s", __func__);

/* if this ever gets implemented, it should be done something like this:
	struct usb_serial *serial = port->serial;
	struct klsi_105_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;
	int control;

	spin_lock_irqsave (&priv->lock, flags);
	if (set & TIOCM_RTS)
		priv->control_state |= TIOCM_RTS;
	if (set & TIOCM_DTR)
		priv->control_state |= TIOCM_DTR;
	if (clear & TIOCM_RTS)
		priv->control_state &= ~TIOCM_RTS;
	if (clear & TIOCM_DTR)
		priv->control_state &= ~TIOCM_DTR;
	control = priv->control_state;
	spin_unlock_irqrestore (&priv->lock, flags);
	retval = mct_u232_set_modem_ctrl(serial, control);
*/
	return retval;
}

module_usb_serial_driver(kl5kusb105d_driver, serial_drivers);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "enable extensive debugging messages");